Piston ring arbor



Feb. 24; 1948. I H, MOLSON 2,436,526

PISTON RING ARBdR Filed April 1, 1946 2 Sheets-Sheet l I \uvam'og HoLLY M.OLSON ATTORNEYS Feb. 24, 1948. L H.-M.'OL SONQ. K 2,436,526

PISION RING ARBOR Filed April 1, 1946 2 Sheets-Sheet 2 mm HoLLY 'M-OLSON .1 g 9 3 W ATTO RN EYS Patented Feb. 24, 1948 IISTON RING ARBOR Holly Olson, Muskegon, -Mich., assignor to Sealed Power Corporation, Muskegon, Mich., a corporation of Michigan Application April 1, 1946, Serial No. 658,817

noted, having ring casting and engaging jaws.

adapted to be forced outwardly radially to engage the ring castings at their inner curved sides and hold them securely against movement with respect to the arbor. As the ring castings are not of circular form, but of an out-of-round character, means are provided for expanding or forcing the jaws outwardly to properly engage the ring castings at their inner curved sides at spaced distances with a yielding pressure, and use a means which is not damaged, and in time, destroyed to the extent that it needs frequent replacement, as in some prior arbors devised for such ring casting splitting or sawing.

An understanding of the invention may be had from the following description taken in connection with the accompanying drawing in which,

Fig. l is a plan view of the arbor and cooperating saws. g

Fig. 2 is an elevation thereof, the ring castings to be divided being shown in section.

Fig. 3 is a horizontal section through the arbor substantially on the plane of line 3-3 of Fig. 4.

Fig. 4 is a vertical section through the arbor and its mounting.

Fig. 5 is a fragmentary side elevation looking against Fig. 4 from the left.

Fig, 6 is a perspective view of a preferred resilient spring member, one of which is used back of each series of vertical ring casting engagingjaws and,

Fig. 7 is a perspective view illustrating a modified form of spring actuatingjjaw member.

Like reference characters refer to like. parts in the different figures of the drawings.

The arbor which I have designed is adapted to be used in a vertical position and turn about a vertical axis, though it-can be as well used when turned about a horizontal axis. Within a fixed housing I, a driven vertical spindle 2 is mounted for rotation having an enlarged head 3, recessed at its upper end and interiorly threadedfor the screw connection of the lower-end of the arbor bodyt, as shown in Fig. 4. '5

The spindle 2 is hollow lengthwise thereof and the arbor body 4 is similarly hollow in the direction of its length, the interior cylindrical passage in the arbor being of a larger diameter than that 5 in the spindle 2. A cylindrical member 5 is mounted for longitudinal movement within the arbor body 4. It is radially slotted from its outer sides inwardly, the construction shown having six slots 6 (Fig. 3) equally spaced from each other. The greatest depth of each slot is at its upper end portion and at its lower portion the bottom of each slot is inclined downwardly and outwardly as indicated at 1 (Fig. 4).

A headed rod 8 passes through an axial passage in the member 5 and has screw connection to a rod 8 which extends through the spindle .2 and may be longitudinally operated to move the member 5 upwardly or downwardly in accordance with the direction of movement of the rod 9.

20 In each of the slots 6 an inwardly extending wedge shaped rib l0, integral at its outer portions with a vertical transverse head II is located, the inner edge of each rib l having the same inclination as the lower portion of the bot- 26 tom of the slot 1 in which it is located. Thus when the member is moved upwardly. the ribs ill with their heads II are simultaneously moved equal distances radially outward.

At the outer side of each head II and midway between its vertical edge an elongated vertical rib I2 is formed. It bears against the center or a resilient member l3 made from a plate of spring material and formed. as shown in Fig. 6 at each vertical side edge with a plurality of consecutive spring fingers M. h

It is to be understood that the body 4 of the arbor is provided with verticalslot openings extending from its outer sides radially inward,

there being the same number of such openingsas there are slots 6 in the member 5, and that the heads II and the resilient members I3 have a width such that they fit said slots and are freely movable therein.

At the outside of each of the resilient members imposed relation. There is thus provided around the arbor a plurality of series of jaws, six of said jaws in each series, each of the series located in a horizontal plane. Each of the series of jaws is adapted to engage the inner curved side of a double width piston ring casting, and said jaws at their outer edges, are formed with serations or teeth to provide firm engagement. Each of the jaws is vertically slotted between its side edges and also horizontally slotted from its outer I3 a plurality of jaws l5 are located in a superedges inwardly for a distance for purposes which will hereinafter appear.

The vertical stacks of jaws, there being six of such stacks in the disclosure made, are each mounted between upper and lower guiding members or bushings I6 and N (Fig. 4) held by screws, the upper member I B'being flattened on its lower side and the-lower member I1 flattened at its upper side. The guiding bushings I6 and I! are ends to the upper and lower ends of a vertical bar I9 which is located in tlie alined-vertical grooves of the jaw members I5. The inner ends of the springs I8 are anchored at the bottoms of the bushings I6 and I'I,- said jaws being thus yieldingly pressed against the fingers I4 of the resilient member I3. At the upper end of "the arbor body a releasable covering cap 20 with spring latches 2| isused to cover the upper end of the arbor'and exclude dirt or other 'ioreign matter.

With the rod' 9 and the expanding member 5 lowered to a position below that in Fig. 4, the

several springs I 8"will withdraw the engaging jaws I5 radially inward, and a plurality of double ring castings 22 may then be placed over the arbor, the lowermost casting rest upon the upper sides of the outer end portions of the bushings I1.

After. placing the required number of the'ring' castings 22 to the height of the uppermost jaws I5, the rod 9 is moved longitudinally in an upward direction forcing the heads II out bya wedging action of the ribs 1 against the inclinedbottoms I of slots 6, and all of the jaws will be simultaneously moved radially upward, stretching the springs I 8 and pressing the serrated outer edge portions of jaws I' against the inner sides of the castings 22, thus securely holding the ring castings in fixed relation to the arbor. It is of course to be understoodth'at the thickness 'of the jaws I5 is the same asthe thickness of a double width ring casting 22.

- As thus'held; the; arbor and the ring castings thereon 'may be rapidly turned by driving-the spindle 2. The ring castings are sawed through between their upper-and lower sides by a proper number 'ofcircular metalsaws- 24, one for each casting; mounted on a carrying head 23' conwhich is mounted so that th e saws maybe'moved toward and away from the castings, thedetail of'which n'eed -not be described. The saws and rings, both rotating about parallel vertical axes, in the vertical stack'of ring castings all or the ca's'tings are s'imultaneously'divided into two ring castings, from each of which the" piston ring'is produced.

3 In such outward'movement ofall of the jaws simultaneouslythe "spring fingers I4 'yield asmuch as may be necessary, 'somemore than others, so that all jaws at their outer'serra't'ed edges have the desired holding engagement thereof with the' inner surfaces of the ring" castings with Wliich they engage. Tha -horizontal groovesat the outer faces of the "jaws I 5 provide spaces into which thei'saw teeth may enter when break n u h at the inner-"sides'of the castings. In Fi '7 'there'is shown, for the head II and the resilient member I3- with 'its opposite spring fingers I4, a substitute in the fo'rm' of a bar25 of the same length but rectangularin cross section', in the outer face ofwhi'ch-"twovertical rows of coiled springs '26 a re nieunted-assnown; said sprin s at their outer ends bearing against the axially bored for the reception of coiled tension ld' springs I8 which are connected at their; outer inner ends of the jaws I5. This provides an equivalent construction with that previously described for a yielding spring pressure against the jaws when they are forced outwardly to engage the ring castings.

After the ring castings have been simultaneously splitor divided .ii'itoi'two parts, rdd 9 is moved downward to reiease*-the j'awspand the divided castings may be removed and a new vertical stack of castings put on the arbor and the operation repeated. The holding and sawing of the "double width castings is very expeditiously fl-lnd'otherh lisesatisfactorily attained. While the nected and rotatable with a; vertical driven shaft" arbor -is'fusd m connection with a vertical spindle and for some'rea'sons such vertical position is :preferred the -arbor may be used mounted to turn about a horizontal axis with the saws driven about" a parallel axis. Further, while the disclosure has been made with respect to holding double width'cas'tings"; eachof' which is' sawed into two artmne-arbor may also beus'ed for holding castings of greatenwidths; sawed or divided into more than twd--parts,:br for holding cast sleeves having a; length: equal to the combined :widths of the plurality of fdouble' width ring castings disclosedeand saidsl'eeves sawedby the saws 24*into adargenuihber beams from each of which a piston ring may be made. The-invention, there- 7 5 being" elongatediry 40 of inclined faees,-'one in opposition" to each of said openings through the body; means for moving said actuatinymernber: selectively in either direction and '"radiall'y positioned expanding members looatedonein" each opening and at its inner side having an inclined face to bear-against an associated in'clin'ed face on the actuating member, a plin'ality bi -ring casting-engaging jaws disposed 'in side' hwside "relation to each other at each of -the openingsin the body,"yielding Y means between-each oi! said plurality of jaws and the outer side of each of said radially-expanding membera'arid'yieldingniieans acting on said jaws to normally press them inwardly;

- 2. A construction -ashamed inclaim. 1, each of 's'a id plurazlity ofiaws beingrecessed in= annementat their outer portions; a; bar located in the alined recesses of each of said plurality-of jaws and-'tensicn-lsprings connected to thends of said bars and to' s'aid bodyi asspecified.

3.-"-A constraetion as dflnedin claim 1, each of said jaws gro'ovedat its out'en portionssubstanti'ai-ly miiiway btween its opposite sides, the outer edges oi said jaws: at sides 'of the grooves beingserratd to brovide aiplurality 'of teeth to 11 engage a'gairfst the inner -si'de of a piston ring casting.

4. An-'-arbor=" as described fc'om'prising asubstantiall fie'yliiidrical body having a cylindrical longitudinal" opening or -pa's'sage 1i therethrough,

i said body at a plurality c'ii tsp'aeedw positions around it having openings radially therethrough,

said openings being elongated in the direction of the length of the body, hollow guides permanently secured one at each end of each of said openings, springs housed one in each of said guides and connected at their inner ends thereto, a bar extending between the guides at each of said openings to the ends of which said springs are connected, a plurality of jaws mounted side by side between the guides at each of said openings, said bars bearing upon the outer portions of the jaws to tend to move then inwardly, an actuating cylindrical member mounted for ion:- gitudinal movement in the longitudinal passage through said body, said cylindrical member having a plurality of radial slots lengthwise thereof one for each opening, the bottoms of said slots having a portion of the length thereof disposed at acute angles to the axis of the actuating member, a radially movable expansion member located at its outer portion in each of said body openings and having a portion extending into a slot in the actuating member, the inner edge of which is disposed at the same angle as the bottom of the slot in which it is received, and yielding spring means between the inner edges of said jaws and the outer side of each of said radial expanding members.

5. A construction as defined in claim 4, and means connected with said actuating member for selectively moving it in either direction in the direction of its length, said spring means between the jaws and the radially expanding members comprising each a flat plate of spring material notched at its opposite edges to provide oppositely extending yielding spring fingers, two of which fingers engage at the back of each of said jaws.

6. A ring casting holding arbor comprising, a cylindrical body adapted to be mounted for rotation about its longitudinal axis, a plurality of spaced series of jaws carried by said body therearound, each of said series of jaws comprising a number of the jaws located in side by side relationship, means for forcing all of the jaws radially outward simultaneously. spring means operatively connected with each of the series of jaws for normally moving them radially inward, and individual spring means at the inner sides of each ofj-said series of jaws yieldable to permit all of the series of jaws to engage the inner curved sides of o'ut-oi-round piston ring castings disposed around said arbor at the outer ends of the aws.

7. A construction as defined in claim 6, each of said jaws at its outer edge portion between opposite sides being grooved and the outer portions of each ofsaid jaws at each side of the groove having teeth for the purposes described.

HOLLY M. OLSON. 

